CN105218920A - The method of foam material prepared by recycle polyethylene recycling - Google Patents
The method of foam material prepared by recycle polyethylene recycling Download PDFInfo
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- CN105218920A CN105218920A CN201510640659.8A CN201510640659A CN105218920A CN 105218920 A CN105218920 A CN 105218920A CN 201510640659 A CN201510640659 A CN 201510640659A CN 105218920 A CN105218920 A CN 105218920A
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
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- C08J9/103—Azodicarbonamide
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/108—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond in a heterocyclic ring containing at least one carbon atom
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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- C08L2207/00—Properties characterising the ingredient of the composition
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- C08L2207/066—LDPE (radical process)
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Abstract
The invention provides a kind of method foam material being prepared by recycle polyethylene recycling, first prepare whipping agent, linking agent, oxidation inhibitor granulation; Then recycle polyethylene and whipping agent pellet, linking agent pellet, oxidation inhibitor pellet, fire retardant pellet are mixed to extrude through twin screw extruder and prepare sheet material, sheet material is put into foaming furnace, after preheating, crosslinked and foaming process, obtain foam materials.This invention simplifies the process of waste polyethylene recycling, after the wide recycle polyethylene in source is carried out simple pre-treatment, be directly used in chemical foaming.By the optimization to formula and complete processing, make reclaimed materials finished product compared with virgin material finished product, properties declines not obvious.
Description
Technical field
Present method relates to a kind of method foam material being prepared by recycle polyethylene recycling, mainly prepares foamed products with waste polyethylene.
Background technology
, as general-purpose plastics, usage quantity is huge for polyethylene (being called for short PE), but its reject product processing mode mostly is the method for burying or burning method.PE degradable hardly under field conditions (factors), the method for burying certainly will cause serious " white pollution ".If larger pollution will certainly be caused to environment by burning rule.
At present to recycle polyethylene mainly through adding toughner, linking agent, mineral filler and other processing aids, carry out modification granulation in an extruder, attempt the use properties being reduced to virgin material.Such as: Yang Yongbing, Chen Qiang have invented a kind of activeness and quietness recycle polyethylene material and method for making (CN103059376A) thereof, recycle polyethylene, crosslinked master batch, toughner, oxidation inhibitor etc. is adopted to mix in homogenizer, then melt blending, extruding pelletization in an extruder.The shortcoming of this method is that technical process is comparatively complicated, and reworked material mechanical property is stable not, is of limited application.
Polyethylene foamed material has insulation, protection against the tide, abrasion-proof, a series of advantageous characteristic such as corrosion-resistant, and social required quantity progressively increases in recent years.But it is higher to ingredient requirement to prepare foamed products, all must produce with pure material, because use waste and old PE easily to cause producing fracture and product performance are unstable all the time.
Therefore, find a kind of better simply method to realize the recycling of waste and old PE, be especially applied in foamed products, can Fei Weibao be become, can reduce costs again.
Summary of the invention
Goal of the invention: problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of method recycled by waste polyethylene plastics.This patent mainly selects waste polyethylene plastics to carry out chemical foaming as body material, substitutes the pure material of PE, to realize recycling better recycle polyethylene when ensureing that goods finished product properties keeps good.
The object of the invention is to be achieved through the following technical solutions:
A method for foam material prepared by recycle polyethylene recycling, comprise the steps:
1) prepare whipping agent, linking agent, oxidation inhibitor granulation: by whipping agent, linking agent, oxidation inhibitor and fire retardant respectively with Low Density Polyethylene in Banbury mixer melt blending, blending temperature is 100 ~ 140 DEG C; Then extruding pelletization in single screw extrusion machine, extrusion temperature 100 ~ 140 DEG C is for obtain whipping agent pellet, linking agent pellet, oxidation inhibitor pellet and fire retardant pellet respectively;
2) according to mass fraction be: recycle polyethylene 15 ~ 50 parts, whipping agent pellet 5 ~ 50 parts, linking agent pellet 0.1 ~ 20 part, oxidation inhibitor pellet 1 ~ 15 part and fire retardant pellet 1 ~ 8 part mix to extrude through twin screw extruder prepares sheet material, and extruder temperature controls at 100-150 DEG C;
3) sheet material is put into foaming furnace, through preheating, be cross-linked and after foaming process, obtain foam materials.
Described whipping agent and Low Density Polyethylene ratio of quality and the number of copies are 1:3 ~ 3:1.Described linking agent and Low Density Polyethylene ratio of quality and the number of copies are 1:100 ~ 10.Described oxidation inhibitor and Low Density Polyethylene ratio of quality and the number of copies are 1:30 ~ 10.Described fire retardant and Low Density Polyethylene ratio of quality and the number of copies are 1:6 ~ 8.
Described waste polyethylene is the mixture of the LDPE of the different trade mark, or is the mixture of LDPE and other types PE.
Described whipping agent is the Cellmic C 121 of azo foaming agent, Diisopropyl azodicarboxylate, diisopropyl azodiformate, diethyl azodiformate, two azoaminobenzenes or Barium azodicarboxylate; Or nitroso compound and hydrazide kind compound as N, N '-dinitrosopentamethlyene tetramine, N, N '-dimethyl-N, N '-dinitrosoterephthalamine, 4,4 '-disulfonyl hydrazide diphenyl ether, to benzol sulfohydrazide, 3,3 '-disulfonyl hydrazide sulfobenzide, 4,4 '-two benzene disulfohydrazide, 1,3-benzene disulfohydrazide or Isosorbide-5-Nitrae-benzene disulfohydrazide.
Described linking agent is the dicumyl peroxide of peroxide linking agent, benzoyl peroxide, ditertiary butyl peroxide or di-isopropylbenzene hydroperoxide.
Described oxidation inhibitor is polyolefine oxidation inhibitor, comprises antioxidant 1010, antioxidant 1076, antioxidant CA, oxidation inhibitor 164, oxidation inhibitor DNP or antioxidant 264; Or it is used in combination with auxiliary irgasfos 168.
Described fire retardant is the mixture of TDE and antimonous oxide, and its ratio of quality and the number of copies is 1:2 ~ 2:1.
Beneficial effect of the present invention is:
A) this invention simplifies the process of waste PE recycling, after the wide recycle polyethylene in source is carried out simple pre-treatment, be directly used in chemical foaming.
B) the present invention is by the optimization to formula and complete processing, makes reclaimed materials finished product compared with virgin material finished product, and properties declines not obvious.
Embodiment
Be described as follows:
Waste polyethylene of the present invention is the refuse plastic from market purchase, and, melt blending granulation composite through classification obtains.Waste or used plastics can be the mixture of the LDPE of the different trade mark, also can be the mixture of LDPE and other types PE.
Described whipping agent pellet is chemical foaming agent and virgin material Low Density Polyethylene (LDPE) banburying extruding pelletization gained.Wherein chemical foaming agent is commercially available chemical foaming agent, preferred azo foaming agent, as Cellmic C 121 (AC), Diisopropyl azodicarboxylate, diisopropyl azodiformate, diethyl azodiformate, two azoaminobenzenes, Barium azodicarboxylate etc.; Also nitroso compound and hydrazide kind compound can be selected, as N, N '-dinitrosopentamethlyene tetramine, N, N '-dimethyl-N, N '-dinitrosoterephthalamine, 4,4 '-disulfonyl hydrazide diphenyl ether, to benzol sulfohydrazide, 3,3 '-disulfonyl hydrazide sulfobenzide, 4,4 '-two benzene disulfohydrazide, 1,3-benzene disulfohydrazide and Isosorbide-5-Nitrae-benzene disulfohydrazide.
Described linking agent pellet is plastics linking agent and virgin material Low Density Polyethylene (LDPE) banburying extruding pelletization gained.Wherein plastics linking agent is commercially available plastics linking agent, preferred peroxide linking agent, as dicumyl peroxide (DCP), benzoyl peroxide, ditertiary butyl peroxide and di-isopropylbenzene hydroperoxide.
Described oxidation inhibitor pellet is polyolefine oxidation inhibitor and virgin material Low Density Polyethylene (LDPE) banburying extruding pelletization gained.Wherein polyolefine oxidation inhibitor is commercially available polyolefine oxidation inhibitor, and as antioxidant 1010, antioxidant 1076, antioxidant CA, oxidation inhibitor 164, oxidation inhibitor DNP and antioxidant 264, and auxiliary is as irgasfos 168.The mixture of preferred antioxidant 1010 and irgasfos 168, its ratio of quality and the number of copies is 1/3 ~ 3/1.
Described fire retardant pellet is additive flame retardant and virgin material Low Density Polyethylene (LDPE) banburying extruding pelletization gained.Wherein additive flame retardant is the mixture of commercially available additive flame retardant, preferred TDE and antimonous oxide, and its ratio of quality and the number of copies is 1/2 ~ 2/1.
Other compositions can also be added to obtain better foaming effect or practical effect.As: thermoplastic elastomer, stablizer, look mother and mineral filler, can add in right amount according to product demand.
Below by embodiment, the present invention is specifically described.
Described waste polyethylene plastics are the refuse plastic from market purchase,, melt blending granulation composite through classification obtains, for the mixture of LDPE and other types PE, melting index (190 DEG C/2.16kg) is 3 (g/10min), and fusing point is 130 DEG C.
Embodiment 1
Formula: waste polyethylene 15g, whipping agent pellet 50g (wherein Cellmic C 121 17g, Low Density Polyethylene 33g), linking agent pellet 12g (wherein dicumyl peroxide 0.6g, Low Density Polyethylene 11.4g), oxidation inhibitor pellet 1g (wherein antioxidant 1010 0.05g, irgasfos 168 0.05g, Low Density Polyethylene 0.9g), fire retardant pellet 1g (wherein TDE 0.1g, antimonous oxide 0.1g and Low Density Polyethylene 0.8g).
Preparation technology
1) melt blending in Banbury mixer by Cellmic C 121 17g and Low Density Polyethylene 33g, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains whipping agent pellet 50g.The melt blending in Banbury mixer by dicumyl peroxide 0.6g and Low Density Polyethylene 11.4g, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains linking agent pellet 12g.By antioxidant 1010 0.3g, irgasfos 168 0.1g and Low Density Polyethylene 7.6g melt blending in Banbury mixer, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains oxidation inhibitor pellet 8g.By TDE 0.1g, antimonous oxide 0.1g and Low Density Polyethylene 0.8g melt blending in Banbury mixer, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains fire retardant pellet 1g.
2) by above-mentioned mixing after granulation material and waste polyethylene 15g drop in twin screw extruder, through plasticizing extrude, extruder temperature is 100 DEG C, obtain PE foam master slice.
3) drop in foaming furnace by master slice, blowing temperature is 220 DEG C, and through trimming after sheet material foaming completely, rolling can obtain product.
Recycle polyethylene foam material expansion ratio prepared by this composition and engineering is 30 times, and density is 28kg/m
3.Product apparent smooth, abscess is regular, without string hole and pinprick, flame retardant effect can reach B level (with reference to GB/8410-2006).
Embodiment 2
Formula: waste polyethylene 30g, whipping agent pellet 40g (wherein Cellmic C 121 13g, Low Density Polyethylene 27g), linking agent pellet 12g (wherein dicumyl peroxide 0.6g, Low Density Polyethylene 11.4g), oxidation inhibitor pellet 8g (wherein antioxidant 1010 0.3g, irgasfos 168 0.1g, Low Density Polyethylene 7.6g), fire retardant pellet 1g (wherein TDE 0.1g, antimonous oxide 0.1g and Low Density Polyethylene 0.8g).
Preparation technology
1) melt blending in Banbury mixer by Cellmic C 121 13g and Low Density Polyethylene 27g, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains whipping agent pellet 40g.The melt blending in Banbury mixer by dicumyl peroxide 0.6g and Low Density Polyethylene 11.4g, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains linking agent pellet 12g.By antioxidant 1010 0.3g, irgasfos 168 0.1g and Low Density Polyethylene 7.6g melt blending in Banbury mixer, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains oxidation inhibitor pellet 8g.By TDE 0.1g, antimonous oxide 0.1g and Low Density Polyethylene 0.8g melt blending in Banbury mixer, melting temperature is 100 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 100 DEG C, obtains fire retardant pellet 1g.
2) by above-mentioned mixing after granulation material and waste polyethylene 30g drop in twin screw extruder, through plasticizing extrude, extruder temperature is 100 DEG C, obtain PE foam master slice.
3) drop in foaming furnace by master slice, blowing temperature is 220 DEG C, and through trimming after sheet material foaming completely, rolling can obtain product.
The recycle polyethylene foam material expansion ratio of preparation is 30 times, and density is 28kg/m
3.Product apparent smooth, abscess is regular, without string hole and pinprick, flame retardant effect can reach B level (with reference to GB/8410-2006).
Embodiment 3
Formula is: waste polyethylene 40g, whipping agent pellet 28g (wherein N, N '-dinitrosopentamethlyene tetramine 10g, Low Density Polyethylene 18g), linking agent pellet 20g (wherein benzoyl peroxide 0.2g, Low Density Polyethylene 19.8g), oxidation inhibitor pellet 8g (wherein antioxidant 1010 0.3g, irgasfos 168 0.1g, Low Density Polyethylene 7.6g), fire retardant pellet 8g (wherein TDE 1g, antimonous oxide 0.5g and Low Density Polyethylene 6.5g).
Preparation technology
1) by N, N '-dinitrosopentamethlyene tetramine 10g, Low Density Polyethylene 18g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains whipping agent pellet 28g.By benzoyl peroxide 0.2g, Low Density Polyethylene 19.8g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains linking agent pellet 16g.By antioxidant 1010 0.3g, irgasfos 168 0.1g and Low Density Polyethylene 7.6g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains oxidation inhibitor pellet 8g.By TDE 1g, antimonous oxide 0.5g and Low Density Polyethylene 6.5g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains fire retardant pellet 8g.
2) by above-mentioned mixing after granulation material and waste polyethylene drop in twin screw extruder, through plasticizing extrude, extruder temperature is 150 DEG C, obtain PE foam master slice.
3) drop in foaming furnace by master slice, blowing temperature is 220 DEG C, and through trimming after sheet material foaming completely, rolling can obtain product.
The recycle polyethylene foam material expansion ratio of preparation is 30 times, and density is 28kg/m
3.Product apparent comparatively smooth, abscess is comparatively regular, without string hole and pinprick, flame retardant effect can reach B level (with reference to GB/8410-2006).
Embodiment 4
Formula: waste polyethylene 50g, whipping agent pellet 20g (wherein N, N '-dinitrosopentamethlyene tetramine 7g, Low Density Polyethylene 13g), linking agent pellet 0.1g (wherein benzoyl peroxide 0.01g, Low Density Polyethylene 0.09g), oxidation inhibitor pellet 8g (wherein antioxidant 1010 0.3g, irgasfos 168 0.1g, Low Density Polyethylene 7.6g), fire retardant pellet 8g (wherein TDE 0.5g, antimonous oxide 0.5g and Low Density Polyethylene 7g).
Preparation technology
1) wherein N, N is incited somebody to action '-dinitrosopentamethlyene tetramine 7g, Low Density Polyethylene 13g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, extruder temperature is 140 DEG C, obtains whipping agent pellet 20g.By benzoyl peroxide 0.01g, Low Density Polyethylene 0.09g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains linking agent pellet 0.1g.By antioxidant 1010 0.3g, irgasfos 168 0.1g and Low Density Polyethylene 7.6g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains oxidation inhibitor pellet 8g.By TDE 0.5g, antimonous oxide 0.5g and Low Density Polyethylene 7g melt blending in Banbury mixer, melting temperature is 140 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 140 DEG C, obtains fire retardant pellet 8g.
2) by above-mentioned mixing after granulation material and waste polyethylene drop in twin screw extruder, through plasticizing extrude, extruder temperature is 150 DEG C, obtain PE foam master slice.
3) drop in foaming furnace by master slice, blowing temperature is 220 DEG C, and through trimming after sheet material foaming completely, rolling can obtain product.
The recycle polyethylene foam material expansion ratio of preparation is 30 times, and density is 28kg/m
3.Apparent comparatively smooth, abscess is comparatively regular, without string hole and pinprick, flame retardant effect can reach B level (with reference to GB/8410-2006).
Embodiment 5
Formula: waste polyethylene 50g, whipping agent pellet 5g (wherein N, N '-dinitrosopentamethlyene tetramine 7g, Low Density Polyethylene 13g), linking agent pellet 16g (wherein benzoyl peroxide 0.8g, Low Density Polyethylene 15.2g), oxidation inhibitor pellet 15g (wherein antioxidant 1010 0.9g, irgasfos 168 0.3g, Low Density Polyethylene 13.8g), fire retardant pellet 8g (wherein TDE 0.5g, antimonous oxide 0.5g and Low Density Polyethylene 7g).
Preparation technology
1) wherein N, N is incited somebody to action '-dinitrosopentamethlyene tetramine 2.5g, Low Density Polyethylene 2.5g melt blending in Banbury mixer, melting temperature is 110 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, extruder temperature is 120 DEG C, obtains whipping agent pellet 5g.By benzoyl peroxide 0.8g, Low Density Polyethylene 15.2g melt blending in Banbury mixer, melting temperature is 110 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 120 DEG C, obtains linking agent pellet 16g.By antioxidant 1010 0.9g, irgasfos 168 0.3g and Low Density Polyethylene 13.8g melt blending in Banbury mixer, melting temperature is 110 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 120 DEG C, obtains oxidation inhibitor pellet 15g.By TDE 0.5g, antimonous oxide 0.5g and Low Density Polyethylene 7g melt blending in Banbury mixer, melting temperature is 110 DEG C, subsequently melt is dropped into granulation in single screw extrusion machine, and extruder temperature is 120 DEG C, obtains fire retardant pellet 8g.
2) by above-mentioned mixing after granulation material and waste polyethylene drop in twin screw extruder, through plasticizing extrude, extruder temperature is 130 DEG C, obtain PE foam master slice.
3) drop in foaming furnace by master slice, blowing temperature is 220 DEG C, and through trimming after sheet material foaming completely, rolling can obtain product.
The recycle polyethylene foam material expansion ratio of preparation is 30 times, and density is 28kg/m
3.Apparent comparatively smooth, abscess is comparatively regular, without string hole and pinprick, flame retardant effect can reach B level (with reference to GB/8410-2006).
Claims (10)
1. prepared by recycle polyethylene recycling a method for foam material, it is characterized in that comprising the steps:
1) prepare whipping agent, linking agent, oxidation inhibitor granulation: by whipping agent, linking agent, oxidation inhibitor and fire retardant respectively with Low Density Polyethylene in Banbury mixer melt blending, blending temperature is 100 ~ 140 DEG C; Then extruding pelletization in single screw extrusion machine, obtains whipping agent pellet, linking agent pellet, oxidation inhibitor pellet and fire retardant pellet respectively;
2) according to mass fraction be: recycle polyethylene 15 ~ 50 parts, whipping agent pellet 5 ~ 50 parts, linking agent pellet 0.1 ~ 20 part, oxidation inhibitor pellet 1 ~ 15 part and fire retardant pellet 1 ~ 8 part mix to extrude through twin screw extruder prepares sheet material, and extruder temperature controls at 100-150 DEG C;
3) sheet material is put into foaming furnace, through preheating, be cross-linked and after foaming process, obtain foam materials.
2. the method for claim 1, is characterized in that whipping agent and Low Density Polyethylene ratio of quality and the number of copies are 1:3 ~ 3:1.
3. the method for claim 1, is characterized in that linking agent and Low Density Polyethylene ratio of quality and the number of copies are 1:100 ~ 10.
4. the method for claim 1, is characterized in that oxidation inhibitor and Low Density Polyethylene ratio of quality and the number of copies are 1:30 ~ 10.
5. the method for claim 1, is characterized in that fire retardant and Low Density Polyethylene ratio of quality and the number of copies are 1:2 ~ 2:1.
6. the method for claim 1, is characterized in that described waste polyethylene is the mixture of the LDPE of the different trade mark, or is the mixture of LDPE and other types PE.
7. the method for claim 1, is characterized in that described whipping agent is the Cellmic C 121 of azo foaming agent, Diisopropyl azodicarboxylate, diisopropyl azodiformate, diethyl azodiformate, two azoaminobenzenes or Barium azodicarboxylate; Or nitroso compound and hydrazide kind compound as N, N '-dinitrosopentamethlyene tetramine, N, N '-dimethyl-N, N '-dinitrosoterephthalamine, 4,4 '-disulfonyl hydrazide diphenyl ether, to benzol sulfohydrazide, 3,3 '-disulfonyl hydrazide sulfobenzide, 4,4 '-two benzene disulfohydrazide, 1,3-benzene disulfohydrazide or Isosorbide-5-Nitrae-benzene disulfohydrazide.
8. the method for claim 1, is characterized in that described linking agent is the dicumyl peroxide of peroxide linking agent, benzoyl peroxide, ditertiary butyl peroxide or di-isopropylbenzene hydroperoxide.
9. the method for claim 1, is characterized in that described oxidation inhibitor is polyolefine oxidation inhibitor, comprises antioxidant 1010, antioxidant 1076, antioxidant CA, oxidation inhibitor 164, oxidation inhibitor DNP or antioxidant 264; Or it is used in combination with auxiliary irgasfos 168.
10. the method for claim 1, it is characterized in that described fire retardant is the mixture of TDE and antimonous oxide, its ratio of quality and the number of copies is 1:2 ~ 2:1.
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| CN108623830A (en) * | 2018-04-26 | 2018-10-09 | 杨传平 | A kind of recycling modified technique of waste polyethylene plastics |
| CN113637253A (en) * | 2021-09-06 | 2021-11-12 | 江苏晶华新材料科技有限公司 | Preparation process of flame-retardant low-density polyethylene |
| CN114044965A (en) * | 2021-11-29 | 2022-02-15 | 江南大学 | Polyethylene foam material and preparation method thereof |
| CN114350011A (en) * | 2022-01-11 | 2022-04-15 | 厦门大学 | Method for preparing foamed product by utilizing regenerated polyethylene |
| CN115725128A (en) * | 2021-08-26 | 2023-03-03 | 中国石油化工股份有限公司 | Composition for regenerated polyethylene foam board and preparation method thereof |
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